You can either remove the entire item (including all subfolders) from the "Worn Items" window, or you can click the bra icon in the item heading to remove the entire item, or click on the icon at the subfolder to remove only that subfolder:
If your item doesn't list the subfolders, you could open the "Wear with options" window (click the shirt icon with the gear). You'll see a list of subfolders. Click the bra icon next to the subfolder you want to remove.
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